193998155 has 32 divisors (see below), whose sum is σ = 264929280. Its totient is φ = 135354240.

The previous prime is 193998137. The next prime is 193998163. The reversal of 193998155 is 551899391.

It is a happy number.

It is not a de Polignac number, because 193998155 - 2⁸ = 193997899 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85526 + ... + 87764.

It is an arithmetic number, because the mean of its divisors is an integer number (8279040).

Almost surely, 2^193998155 is an apocalyptic number.

193998155 is a deficient number, since it is larger than the sum of its proper divisors (70931125).

193998155 is a wasteful number, since it uses less digits than its factorization.

193998155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331.

The product of its digits is 437400, while the sum is 50.

The square root of 193998155 is about 13928.3220453865. The cubic root of 193998155 is about 578.8942020403.

The spelling of 193998155 in words is "one hundred ninety-three million, nine hundred ninety-eight thousand, one hundred fifty-five".